<template>
    <div class="song-list">
        <!-- 歌单详情 -->
        <van-nav-bar title="歌单详情" left-text="返回" left-arrow @click-left="onClickLeft" />
        <!-- 歌单的顶部 -->
        <div class="header">
            <img :src="song.logo" alt="">
            <h4>{{ song.dissname }}</h4>
            <div class="nick">
                <img :src="song.headurl" alt="">
                <span>{{ song.nickname }}</span>
            </div>
            <span>播放量：{{ song.visitnum | numFilter(1) }}万</span>
        </div>
        <!-- 歌单列表 -->
        <div class="list">
            <van-list v-model="loading" :finished="findished" finished-text="没有更多了" @load="onLoad">
                <div v-for="(item, index) in list" :key="index" :title="item" class="song">
                    <h3>{{ item.songname }}</h3>
                    <div class="singers">
                        <span v-for="(singer, index) in item.singer" :key="singer.id">
                            {{ singer.name }}
                            <span v-show="index != item.singer.length - 1">/</span>
                        </span>
                        <span v-show="item.albumname">
                            <span>.</span>
                            <span>{{ item.albumname }}</span>
                        </span>
                    </div>
                </div>
            </van-list>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            song: {
                dissname: "",  //标题
                logo: "",     //歌单logo
                headurl: "",  //歌单制作者头像
                nickname: "",  //歌单制作者名称
                visitnum: 0,  //歌单播放量
            },
            songlist: [],  //歌单列表
            songnum: 0,     //歌单列表数目
            list: [],
            loading: false,
            finished: false,
        };
    },
    created() {
        this.getListData();
    },
    methods: {
        getListData() {
            this.$request('get', '/songlist?id=' + this.$route.params.id)
                .then((res) => {
                    // console.log(res);
                    this.song.dissname = res.data.dissname;
                    this.song.logo = res.data.logo;
                    this.song.headurl = res.data.headurl;
                    this.song.nickname = res.data.nickname;
                    this.song.visitnum = res.data.visitnum;
                    this.songlist = res.data.songlist;
                    this.songnum = res.data.songnum;
                }
                );
        },
        onClickLeft() {
            //如果历史记录大于1，那么返回到上一层，如果历史记录小于等于1，返回到根路由
            window.history.length > 1 ? this.$router.go(-1) : this.$router.push('/')
        },
        onLoad() {
            setTimeout(() => {
                //注意splice和slice方法的差异
                this.list = this.list.concat(this.songlist.splice(0, 10))
                // console.log(this.list)

                //加载状态结束
                this.loading = false;

                //数据全部加载完成
                if (this.list.length >= this.songnum) {
                    this.finished = true;
                }
            }, 1000);
        },
    },
}
</script>

<style scoped>
.header>img {
    border-radius: 1rem;
    width: 50%;
}

.nick {
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
}

.nick>img {
    height: 2rem;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.nick>span {
    height: 2rem;
    font-size: 0.8rem;
    line-height: 2rem;
}

.song {
    margin-bottom: 1rem;
}

.song>h3 {
    text-align: left;
    font-size: 1rem;
    padding: 0 2rem;
    margin: 0;
}

.singers {
    text-align: left;
    padding: 0 2rem;
}

.singers span {
    font-size: 0.8rem;
    color: gray;
}

.singers>span:nth-last-child(1)>span:nth-child(1) {
    margin: 0 0.3rem;
    font-weight: 900;
    color: red;
}
</style>